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#include <fcntl.h>
#ifdef DEBUG
# define PRINTF printf
#else
# define PRINTF(...)
#endif
// RETURN VALUE:
// 0 : ok
// 1 : no file /proc/sys/dev/cdrom
// 2 : failed to chdir /dev
// 3 : cdrom found but cannot creat /dev/cdrom
// 4 : no cdrom data found
int main() {
int fd,fd2,s,t=0;
char tmp[4096],buff[4096],*p,*f;
static const char nocdrom[]="No CDROM found\n";
// find CDROM detection in /proc/sys/dev/cdrom/info
if ((fd=open("/proc/sys/dev/cdrom/info",O_RDONLY)) < 0) {
write(2,nocdrom,sizeof(nocdrom));
exit(1);
}
if (chdir("/dev")) {
PRINTF("Cannot chdir to /dev\n");
exit(2);
}
// looking for "driver name:"
while ((s=read(fd,tmp+t,4096-t)) > 0) {
t+=s;
if ((p=(char*)strstr(tmp,"\ndrive name:")) && strchr(p+=13,'\n')) {
// have found it, looking for drive name(s)
while (*p != '\n') {
while (*p == ' ' || *p == '\t') p++;
for (f=p;*f > ' ' ; f++) ;
if (*f == '\n') *f=0; else *f++=0;
// found and now try
PRINTF("Trying [%s]\n",p);
if ((fd2=open(p,O_RDONLY)) >= 0) {
// read a small packet to detect valid iso9660
if (read(fd2,buff,4096) > 0) {
close(fd2);
close(fd);
// creat the symbolic link to /dev/cdrom
if (symlink(p,"cdrom") == 0) {
#ifdef DEBUG
write(2," ",2);
#endif
write(2,"Found CDROM: ",13);
write(2,p,strlen(p));
write(2,"\n",1);
exit(0);
}
exit(3);
}
PRINTF(" read failed\n");
close(fd2);
} else {
PRINTF(" open failed\n");
}
p=f;
}
break;
}
}
if (s >= 0) close(fd);
write(2,nocdrom,sizeof(nocdrom));
return (4);
}
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